No. Tax year 2018 does not end until after 12/31/2018. A tax return cannot be filed until January 2019. The IRS has not yet even published when they will be accepting any type of 2018 tax return. Estimate it will be in late January or early February.
With the changes to the tax code and the tax forms it will especially be unwise to try to file early unless you want to wait for weeks to find out that your tax return has either been accepted or rejected by the IRS.
